1/4(4r-8)r-2

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Solution for 1/4(4r-8)r-2 equation: 


r in (-oo:+oo)

(1/4)*r*(4*r-8)-2 = 0

1/4*r*(4*r-8)-2 = 0

1/4*r*(4*r-8)-2 = 0

r^2-2*r-2 = 0

r^2-2*r-2 = 0

r^2-2*r-2 = 0

DELTA = (-2)^2-(-2*1*4)

DELTA = 12

DELTA > 0

r = (12^(1/2)+2)/(1*2) or r = (2-12^(1/2))/(1*2)

r = (2*3^(1/2)+2)/2 or r = (2-2*3^(1/2))/2

(r-((2-2*3^(1/2))/2))*(r-((2*3^(1/2)+2)/2)) = 0

(r-((2-2*3^(1/2))/2))*(r-((2*3^(1/2)+2)/2)) = 0

( r-((2*3^(1/2)+2)/2) )

r-((2*3^(1/2)+2)/2) = 0 // + (2*3^(1/2)+2)/2

r = (2*3^(1/2)+2)/2

( r-((2-2*3^(1/2))/2) )

r-((2-2*3^(1/2))/2) = 0 // + (2-2*3^(1/2))/2

r = (2-2*3^(1/2))/2

r in { (2*3^(1/2)+2)/2, (2-2*3^(1/2))/2 }

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